// SPDX-License-Identifier: GPL-2.0-only
/*
 * Sync File validation framework and debug information
 *
 * Copyright (C) 2012 Google, Inc.
 */

#include <linux/debugfs.h>
#include "sync_debug.h"

#ifdef CONFIG_DEBUG_FS
static struct dentry *dbgfs;

static LIST_HEAD(sync_timeline_list_head);
static DEFINE_SPINLOCK(sync_timeline_list_lock);
static LIST_HEAD(sync_file_list_head);
static DEFINE_SPINLOCK(sync_file_list_lock);

void sync_timeline_debug_add(struct sync_timeline *obj)
{
    unsigned long flags;

    spin_lock_irqsave(&sync_timeline_list_lock, flags);
    list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head);
    spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
}

void sync_timeline_debug_remove(struct sync_timeline *obj)
{
    unsigned long flags;

    spin_lock_irqsave(&sync_timeline_list_lock, flags);
    list_del(&obj->sync_timeline_list);
    spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
}

void sync_file_debug_add(struct sync_file *sync_file)
{
    unsigned long flags;

    spin_lock_irqsave(&sync_file_list_lock, flags);
    list_add_tail(&sync_file->sync_file_list, &sync_file_list_head);
    spin_unlock_irqrestore(&sync_file_list_lock, flags);
}

void sync_file_debug_remove(struct sync_file *sync_file)
{
    unsigned long flags;

    spin_lock_irqsave(&sync_file_list_lock, flags);
    list_del(&sync_file->sync_file_list);
    spin_unlock_irqrestore(&sync_file_list_lock, flags);
}

static const char *sync_status_str(int status)
{
    if (status < 0) {
        return "error";
    }

    if (status > 0) {
        return "signaled";
    }

    return "active";
}

static void sync_print_fence(struct seq_file *s, struct dma_fence *fence, bool show)
{
    struct sync_timeline *parent = dma_fence_parent(fence);
    int status;

    status = dma_fence_get_status_locked(fence);

    seq_printf(s, "  %s%sfence %s", show ? parent->name : "", show ? "_" : "", sync_status_str(status));

    if (test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags)) {
        struct timespec64 ts64 = ktime_to_timespec64(fence->timestamp);

        seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec);
    }

    if (fence->ops->timeline_value_str && fence->ops->fence_value_str) {
        char value[64];
        bool success;

        fence->ops->fence_value_str(fence, value, sizeof(value));
        success = strlen(value);
        if (success) {
            seq_printf(s, ": %s", value);

            fence->ops->timeline_value_str(fence, value, sizeof(value));

            if (strlen(value)) {
                seq_printf(s, " / %s", value);
            }
        }
    }

    seq_putc(s, '\n');
}

static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
{
    struct list_head *pos;

    seq_printf(s, "%s: %d\n", obj->name, obj->value);

    spin_lock_irq(&obj->lock);
    list_for_each(pos, &obj->pt_list)
    {
        struct sync_pt *pt = container_of(pos, struct sync_pt, link);
        sync_print_fence(s, &pt->base, false);
    }
    spin_unlock_irq(&obj->lock);
}

static void sync_print_sync_file(struct seq_file *s, struct sync_file *sync_file)
{
    char buf[128];
    int i;

    seq_printf(s, "[%p] %s: %s\n", sync_file, sync_file_get_name(sync_file, buf, sizeof(buf)),
               sync_status_str(dma_fence_get_status(sync_file->fence)));

    if (dma_fence_is_array(sync_file->fence)) {
        struct dma_fence_array *array = to_dma_fence_array(sync_file->fence);

        for (i = 0; i < array->num_fences; ++i) {
            sync_print_fence(s, array->fences[i], true);
        }
    } else {
        sync_print_fence(s, sync_file->fence, true);
    }
}

static int sync_info_debugfs_show(struct seq_file *s, void *unused)
{
    struct list_head *pos;

    seq_puts(s, "objs:\n--------------\n");

    spin_lock_irq(&sync_timeline_list_lock);
    list_for_each(pos, &sync_timeline_list_head)
    {
        struct sync_timeline *obj = container_of(pos, struct sync_timeline, sync_timeline_list);

        sync_print_obj(s, obj);
        seq_putc(s, '\n');
    }
    spin_unlock_irq(&sync_timeline_list_lock);

    seq_puts(s, "fences:\n--------------\n");

    spin_lock_irq(&sync_file_list_lock);
    list_for_each(pos, &sync_file_list_head)
    {
        struct sync_file *sync_file = container_of(pos, struct sync_file, sync_file_list);

        sync_print_sync_file(s, sync_file);
        seq_putc(s, '\n');
    }
    spin_unlock_irq(&sync_file_list_lock);
    return 0;
}

DEFINE_SHOW_ATTRIBUTE(sync_info_debugfs);

static __init int sync_debugfs_init(void)
{
    dbgfs = debugfs_create_dir("sync", NULL);

    /*
     * The debugfs files won't ever get removed and thus, there is
     * no need to protect it against removal races. The use of
     * debugfs_create_file_unsafe() is actually safe here.
     */
    debugfs_create_file_unsafe("info", 0444, dbgfs, NULL, &sync_info_debugfs_fops);
    debugfs_create_file_unsafe("sw_sync", 0644, dbgfs, NULL, &sw_sync_debugfs_fops);

    return 0;
}
late_initcall(sync_debugfs_init);
#endif
